// Import a list of files and/or directories from a drag-drop operation to a specific classification
        public static void ImportFiles(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            List <object>    args   = e.Argument as List <object>;

            string[] filenames      = args[0] as string[];
            string   classification = args[1] as string;

            if (filenames != null && filenames.Length > 0)
            {
                try
                {
                    // Sort files and dirs
                    ArrayList fileList = new ArrayList();
                    ArrayList dirList  = new ArrayList();
                    foreach (string filename in filenames)
                    {
                        if (Directory.Exists(filename))
                        {
                            dirList.Add(filename);
                        }
                        else if (File.Exists(filename))
                        {
                            fileList.Add(filename);
                        }
                    }

                    // Add each directory seperately
                    foreach (string dirname in dirList)
                    {
                        MOG_ControllerLibrary.AddDirectory(dirname, classification);
                    }

                    // Add all the files
                    MOG_ControllerLibrary.AddFiles(fileList, classification);
                }
                catch
                {
                }
            }
        }